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  • On the solar oscillator strength of SiH^{+} 
    Trivedi, C; Sinha, K (Astronomical Society of India, 1997)
    Rather contrasting values of the oscillator strengths for the (0,0) band of SiH+ molecules for the A 1II - X1 capital sigma+ transition have been reported in the literature. We investigate these with the help of a new set ...
  • On the spark spectra of lead 
    Rao, A. S (Government Observatory, Madras, 1930-12-22)
  • On the Spectral Curvature of VHE Blazar 1ES 1011 + 496: Effect of Spatial Particle Diffusion 
    Sinha, A; Sahayanathan, S; Acharya, B. S; Anupama, G. C; Chitnis, V. R; Singh, B. B (IOP Publishing, 2017-02-10)
    The American Astronomical Society, find out more The Institute of Physics, find out more On the Spectral Curvature of VHE Blazar 1ES 1011+496: Effect of Spatial Particle Diffusion Atreyee Sinha1, S. ...
  • On the stability of helical velocity and magnetic fields 
    Kochhar, R. K (D. Reidel Publishing Company, 1978-05)
    In this paper we study the stability of an infinitely conducting, incompressible, inviscid infinite cylinder with non-parallel helical velocity and magnetic field. It is shown that the system is stable if the energy in the ...
  • On the stability of the hypothetical quintet system of TW Draconis 
    Abhyankar, K. D; Bhatia, R. K; Devadas Rao, P (Astronomical Society of India, 1985-09)
    Aarseth`s NBODY 1 code is used to study the stability of the quintet system of DW Draconis postulated by Abhyankar & Panchatsaram (1984). It is found that the observed (O - C) curve based on the ephemeris by Tremko & Kreiner ...
  • On the statistical detection of propagating waves in polar coronal holes 
    Gupta, G. R; O'Shea, E; Banerjee, D; Popescu, M; Doyle, J. G (EDP Sciences, 2009-01)
    Context. Waves are important to the study of dynamical processes in coronal holes and the acceleration of the fast solar wind. A spectral time series was taken with the SUMER spectrometer on-board SoHO on 20 October 1996. ...
  • On the survivability of cosmological quark nuggets 
    Bhattacharjee, P (World Scientific, 1994)
    The question of survivability of quark nuggets against the process of baryon evaporation from their surfaces is discussed within the context of a dynamical model, namely, the chromoelectric flux-tube fission model of baryan ...
  • On the temperature distribuiton along a solar flare loop 
    Narain, Udit (Astronomical Society of India, 1983-03)
    We have obtained expressions for temperature distribution along a solar flare in the presence of a source of continued heating in constant cross section and line dipole geometries under nonstatic conditions. The quantitative ...
  • On the tidal disruption of a spherical galaxy 
    Namboodiri, P. M. S; Kochhar, R. K (Blackwell Publishing, 1991-12)
    The disruption of a satellite galaxy as it undergoes collision with a massive perturber is investigated by numerical simulations. The models are restricted by a constant pericentric distance. The disruption of the satellite ...
  • On the total eclipse of the sun, on december the 11th, 1871, as visible in the Madras presidency 
    Ragoonatha Chary, C (Royal Astronomical Society, 1871)
  • On the triggering of a spotless double-ribbon flare 
    Rausaria, R. R; Aleem, S. M; Sundararaman, K (Springer Netherlands, 1992-11)
    We have studied the evolution of the double-ribbon, spotless flare of 21 February, 1992, using Kodaikanal Hagr and Kf1 observations. The analysis of the data shows that the Hagr filament underwent a large change in shear ...
  • On the triggering of quiet region flares without filament activation 
    Sundararaman, K; Selvendran, R (Astronomical Society of India, 1997)
    Using Kodaikanal Observations we have analysed the cases of quiet region flares which are not associated with any filament activation. The rotations of the plages play a major role in triggering these spotless flares. The ...
  • On the Ultraviolet Fluxes of Be-Stars 
    Joshi, S. C; Rautela, B. S (Astronomical Society of Indian, 1987-12)
    The ultraviolet fluxes of a sample of Be and normal B stars taken from ultraviolet bright-star spectrophotometric catalogue and its supplement have been compared with model atmosphere fluxes. An ultraviolet temperature has ...
  • On the unusual surge of 1991 November 16 
    Bondal, K. R; Gaur, V. P; Joshi, A; Uddin, W; Pande, M. C (Astronomical Society of India, 1994)
    An unusually 'long' surge of 'short' duration occurred in the NW region of the sun's limb on 1991 November 16, around 04 15 UT. Time-lapse photographic observations employing a Halle H-alpha filter having a 0.5/0.7 A ...
  • On the usefulness of existing solar wind models for pulsar timing corrections 
    Tiburzi, C; Verbiest, J. P. W; Shaifullah, G. M; Janssen, G. H; Anderson, J. M; Horneffer, A; Kunsemoller, J; Ostowski, S; Donner, J. Y; Kramer, M; Anshu Kumari; Porayko, N. K; Zucca, P; Ciardi, B; Dettmar, R.J; Griebmeier, J.M; Hoeft, M; Serylak, M (Oxford University Press on behalf of the Royal Astronomical Society, 2019-07)
    Dispersive delays due to the solar wind introduce excess noise in high-precision pulsar timing experiments, and must be removed in order to achieve the accuracy needed to detect, e.g., low-frequency gravitational waves. ...
  • On the Variability of the Solar Mean Magnetic Field: Contributions from Various Magnetic Features on the Surface of the Sun 
    Souvik Bose; Nagaraju, K (IOP Publishing, 2018-07-20)
    The solar mean magnetic field (SMMF) is referred to as the disk-averaged line-of-sight (LOS) magnetic field that also reflects the polarity imbalance of the magnetic field on the Sun. The origin of the SMMF has been debated ...
  • On the Variation in the Volumetric Evolution of CMEs from the Inner to Outer Corona 
    Majumdar, Satabdwa; Patel, Ritesh; Pant, Vaibhav (American Astronomical Society, 2022-04-10)
    Some of the major challenges faced in understanding the early evolution of coronal mass ejections (CMEs) are due to the limited observations in the inner corona (<3 R⊙) and the plane-of-sky measurements. In this work, we ...
  • On the visual light curve of RT. Eridani 
    Bappu, M. K. V (Indian Academy of Sciences, 1946-07)
  • On the Weakening of the Chromospheric Magnetic Field in Active Regions 
    Nagaraju, K; Sankarasubramanian, K; Rangarajan, K. E (The American Astronomical Society, 2008-05)
    Simultaneous measurement of line-of-sight (LOS) magnetic and velocity fields at the photosphere and chromosphere are presented. The Fe i line at λ6569 and Hα at λ6563 are used for deriving the physical parameters at ...
  • On the widths and ratios of MgX 609.79 and 624.94 Å lines in polar off-limb regions 
    O`Shea, E; Banerjee, D; Doyle, J. G (EDP Science, 2005-06)
    Using measurements of MgX 609.78 and 624.94 Å lines from the Coronal Diagnostic Spectrometer (CDS) on board SOHO, we seek to examine the variation of line width and line ratio in regions far off-limb at the Northern pole ...

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